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FAQs: Is a concrete sink waterproof? Will it crack or stain?
Using Prefab Sink Molds: How concrete sinks are made

The Concrete Countertop Institute

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If you're considering a concrete sink, you may have additional questions. Here are some questions answered by various decorative concrete companies.


Does the concrete ever crack?
Yes, hairline cracking may occur. These are not structural and are part of the character of concrete.

Does the concrete stain or is it waterproof?
The concrete is sealed making it water and stain resistant (spec sheets can be sent on request).

What if I want a color that is not in the sample package?
We can make custom colors attempting to match almost any color, there is a $75.00 charge that is applied to your order.

Does the color ever vary?
Yes, every order is custom which lends to the products uniqueness.

What is the maximum size slab we can make?
Approximately 7' x 3', otherwise it has a tendency to crack or become too heavy to work with, seaming may be required.


What about seams?
Seams are approximately 0.25" and filled with matching epoxy grout. Although visible, they do not detract from the aesthetic quality at all.

Will they crack?
No. With our proprietary mix, steel and glass-fiber reinforcement coupled with special curing techniques and additives, we guarantee our products against structural cracking under normal conditions. Hairline cracks (literally a hair's width and invisible from 3 feet away) are inherent in concrete and may occur. They are superficial and often make the concrete look even more like stone.

Do you build them in my house?
Absolutely not. All our work is PRECAST in our workshop with very few exceptions. Working off-site allows us to create our custom sinks, special integral features, edges and finishes; control important elements such as temperature, humidity and water which affect curing and strength; and to utilize any special equipment, machinery and materials without worrying about a customer's cabinets or interior. Our techniques, without exception, produce the highest quality and strongest concrete available today.

How do you care for them?
Clean-up spills using a mild cleaner such as Simple Green, wiping daily. Wax weekly during the first month and then semi-annually. Avoid repeated or prolonged placement of objects over 300F. Buffing the surface regularly with a soft cloth will enhance the shine and increase the durability of the sealer. The use of bleach, harsh abrasives or caustic cleaners may be detrimental to the concrete. In drastic circumstances, concrete can always be re-colored, re-sealed, refinished or repaired.


Is it heavy?
Our standard mix using lightweight aggregates weighs approximately 12lb. - 13lb./sq. ft. for 1.5" thickness. This is well within load capacities for standard North American residential construction and modular kitchen cabinets. In general, no extra support or stiffening is required. Using fiber and polymer additives concrete slabs may be cast much lighter with greater span capabilities.

How thick is it?
1.5" thick is standard and as thin as 0.75" for slabs. Drop edges of up to 12" may be incorporated for a heavier look. Tiles and panels may be as thin as 0.5

Does it look like a sidewalk?
Absolutely not! In general, our surfaces are as smooth as glass. If anything, it looks like stone with the added characteristic that it may be colored to create depth and richness. We like to say it looks like concrete!

Will it crack?
If it hasn't cracked by the time it leaves our shop then it's not going to. Concrete continues to harden for up to 50 years. Due to casting and reinforcement techniques used and proper curing, structural cracks are extremely rare. Superficial hairline surface cracks may, in time, occur but do not affect the strength or functionality of the concrete in any way and may even add to the organic appeal of the material.

How long does it last?
Potentially, forever. Under normal use your concrete countertop, sink or vanity will outlast the house that it is in. The only thing that can deteriorate concrete is prolonged exposure to salt water or freeze/thaw cycles.

What about sealers?
We use the best industrial sealers on the market today. The vast majority of our products are sealed with semi gloss, food safe, low VOC, water-borne urethane epoxies. They are very tough, compatible with concrete and highly resistant to scratching or staining. Under normal use this sealer may last up to ten years.

Are there seams?
Yes, there are seams. They are less than 1/8" wide and filled with matching grout. Seams do not detract from the overall appearance of the concrete, on the contrary, they add character and dimension.

How long does it take?
Concrete must cure at least 14 days before it is safe to transport. We prefer to double that. So, expect 4 - 6 weeks from the time we receive templates.

Is it cheaper than granite?
It can be, and most of our standard items are. However, making concrete is labor intensive. Each piece is individually made and requires many steps to a final product. Custom pieces and complex shapes may cost more than granite.

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